DUE: THURS DAY (11/1/ 12) S TART OF CLASS Name: ____________________ Period: ________________ Date: Purpose: To explore the mechanical advantage provided by different pulley systems. You will be examining different pulley configuration s to help you understand the concept of Mechanical Advantage (MA). Materials: ring stand, pulleys, string, spring scale, weight, meter stick Vocabulary: block and tackle, conservation of energy, efficiency, friction, input force, load, mechanical advantage, output force, pulley, pulley system, simple machine, work Prior KnowledgeA pulley is a wheel with a groove for a rope or cable. The image at left shows an example of a pulley system, also called a block and tackle. Procedure: #1: Single Fix Pulley 1. Use spring scale to determine the object’s mass (record in data table). 2. Setup pulley as shown. 3. Use the spring scale to measure the force required to lift the weight (record in data table). 4. Count the number of s trings pulling in the upward direction (record in data table). 5. Measure the height the object moves v ersus the distance the spring scale moves (record in data table). 6. Calculate AMA and IMA (record in data table). #2: Single Moveable Pulley 1. Use spring scale to determine the object’s mass (record in data table). 2. Setup pulley as shown. 3. Use the spring scale to measure the force required to lift the weight (record in data table). 4. Count the number of s trings pulling in the upward direction (record in data table). 5.Measure the height the object moves versus the distance the spring scale moves (record in data table). 6.Calculate AMA and IMA (record in data table).
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Purpose: To explore the mechanical advantage provided by different pulleysystems. You will be examining different pulley configurations to help youunderstand the concept of Mechanical Advantage (MA).
Materials: ring stand, pulleys, string, spring scale, weight, meter stick
Vocabulary: block and tackle, conservation of energy, efficiency, friction, inputforce, load, mechanical advantage, output force, pulley, pulley system, simplemachine, work
Prior Knowledge
A pulley is a wheel with a groove for a rope or cable. The image at left showsan example of a pulley system, also called a block and tackle.
Procedure:
#1: Single Fix Pulley
1. Use spring scale to determine the object’s mass (record in data
table).2. Setup pulley as shown.3. Use the spring scale to measure the force required to lift the weight
1. Use spring scale to determine the object’s mass (record in datatable).
2. Setup pulley as shown.3. Use the spring scale to measure the force required to lift the weight
(record in data table).4. Count the number of strings pulling in the upward direction (record in
data table).5. Measure the height the object moves versus the distance the spring
scale moves (record in data table).6. Calculate AMA and IMA (record in data table).
#4: Double Fixed, Single Moveable
1. Use spring scale to determine the object’s mass (record in data table).2. Setup pulley as shown.3. Use the spring scale to measure the force required to lift the weight (record
in data table).4. Count the number of strings pulling in the upward direction (record in data
table).5. Measure the height the object moves versus the distance the spring scale
moves (record in data table). 6. Calculate AMA and IMA (record in data table).
conservation of energy states that in a closed system the total energyis constant. In other words, energy is neither created nor destroyed.
When using a simple machine, you use less force. What do you have to do more of inexchange?_________________________________________________________________
Concept: A pulley is an example of a simple machine. Many simple machines are usefulbecause they allow the user to lift a heavy weight using less force than it would take to lift theweight directly. The mechanical advantage of the machine is a measure of this benefit.
Explain why the number of support ing ropes determines the mechanical advantage? __________________________________________________________________________ __________________________________________________________________________
Why can you count a section of rope you are pulling up on, but not a section you arepulling down on? _________________________________________________________